Bar(A),δ) and prove that Bar~ψ(A) is a resolution of both A and C. Furthermore,δis an A-bimodule map.
C及A的预解式，且δ是A-双模映射。
参考来源 - 代数弱缠绕余代数的上同调结构
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Bimodule
abstract:In abstract algebra a bimodule is an abelian group that is both a left and a right module, such that the left and right multiplications are compatible. Besides appearing naturally in many parts of mathematics, bimodules play a clarifying role, in the sense that many of the relationships between left and right modules become simpler when they are expressed in terms of bimodules.